/* 학생 접속 사이트 (휴대폰·태블릿 우선) */
:root {
  --bg: #f7f5f0;
  --panel: #ffffff;
  --text: #1d232b;
  --muted: #6a7380;
  --line: #e4e0d8;
  --accent: #0e8a6a;
  --accent-soft: #e2f5ee;
  --on-accent: #fff;   /* 밝은 accent 위 글자색: 다크 모드에서만 어둡게 */
  --u4: #d9480f; --u5: #1971c2; --u6: #2b8a3e;
  --ok: #2f9e44; --bad: #e03131;
  --font: 17px;
  --s: .6;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14161a; --panel: #1e2127; --text: #eef1f5; --muted: #a2abb7; --line: #2f343c;
    --accent: #3fcf9f; --accent-soft: #163a30; --on-accent: #0b1f18;
  }
}
:root[data-theme="dark"] {
  --bg: #14161a; --panel: #1e2127; --text: #eef1f5; --muted: #a2abb7; --line: #2f343c;
  --accent: #3fcf9f; --accent-soft: #163a30; --on-accent: #0b1f18;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body.site {
  font-family: "SCoreDream", "Malgun Gothic", system-ui, sans-serif;
  font-size: var(--font); line-height: 1.7; background: var(--bg); color: var(--text);
  -webkit-tap-highlight-color: transparent;
}
a { color: inherit; }
button { font: inherit; color: inherit; cursor: pointer; }

.topbar {
  position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 10px;
  padding: 10px 16px; background: var(--panel); border-bottom: 1px solid var(--line);
}
.logo { display: flex; align-items: center; gap: 8px; text-decoration: none; font-weight: 500; flex: 1; min-width: 0; }
.logo span:last-child { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.logo-mark { width: 34px; height: 34px; border-radius: 10px; background: var(--accent); color: var(--on-accent, #fff); display: grid; place-items: center; flex: 0 0 auto; }
.plan-name { font-size: 13px; color: var(--muted); white-space: nowrap; }
.xp { background: var(--accent-soft); color: var(--accent); border-radius: 999px; padding: 4px 12px; font-size: 14px; white-space: nowrap; }
.top-btn { min-height: 40px; padding: 0 12px; border-radius: 10px; border: 1px solid var(--line); background: var(--panel); text-decoration: none; display: inline-flex; align-items: center; font-size: 14px; font-weight: 500; white-space: nowrap; }

.unit-tabs { display: flex; gap: 8px; overflow-x: auto; padding: 10px 16px; background: var(--panel); border-bottom: 1px solid var(--line); scrollbar-width: thin; }
.utab { white-space: nowrap; text-decoration: none; padding: 8px 14px; border-radius: 999px; background: var(--bg); font-weight: 500; font-size: 15px; }
.utab.on { color: #fff; }
.utab.on.u4 { background: var(--u4); } .utab.on.u5 { background: var(--u5); } .utab.on.u6 { background: var(--u6); }

.main { max-width: 1760px; margin: 0 auto; padding: 18px clamp(16px, 3vw, 56px) 80px; }
.empty { text-align: center; color: var(--muted); padding: 40px 0; }
.page-h { font-size: 1.6em; margin: 6px 0 14px; }

/* 처음 화면 */
.hero { border-radius: 20px; padding: 22px; color: #fff; margin-bottom: 16px; }
.hero.u4 { background: linear-gradient(135deg, #d9480f, #f08c00); }
.hero.u5 { background: linear-gradient(135deg, #1864ab, #4dabf7); }
.hero.u6 { background: linear-gradient(135deg, #2b8a3e, #69db7c); }
.hero h1 { margin: 2px 0 12px; font-size: 1.6em; line-height: 1.3; }
.hero-kicker { opacity: .9; font-weight: 500; }
.hero p { margin: 6px 0 0; font-weight: 500; }
.bar { height: 12px; border-radius: 6px; background: rgba(255,255,255,.35); overflow: hidden; }
.bar span { display: block; height: 100%; background: #fff; border-radius: 6px; }
.lesson-list { display: grid; gap: 10px; }
.lesson-card { display: flex; align-items: center; gap: 14px; padding: 14px 16px; border-radius: 16px; background: var(--panel); border: 1px solid var(--line); text-decoration: none; }
.lesson-card.passed { border-color: var(--ok); }
.lc-no { flex: 0 0 auto; width: 40px; height: 40px; border-radius: 50%; background: var(--accent-soft); color: var(--accent); display: grid; place-items: center; font-weight: 500; }
.lesson-card.passed .lc-no { background: var(--ok); color: #fff; }
.lc-body { flex: 1; min-width: 0; display: grid; }
.lc-title { font-weight: 500; line-height: 1.35; }
.lc-sub { color: var(--muted); font-size: .85em; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.lc-state { flex: 0 0 auto; font-size: .85em; font-weight: 500; color: var(--accent); }

/* 차시 */
.crumb { color: var(--muted); font-size: .9em; margin-bottom: 10px; }
.crumb a { text-decoration: none; }
.lesson-head { background: var(--panel); border-radius: 20px; padding: 22px; border-top: 8px solid var(--accent); margin-bottom: 18px; }
.lesson-head.u4 { border-top-color: var(--u4); } .lesson-head.u5 { border-top-color: var(--u5); } .lesson-head.u6 { border-top-color: var(--u6); }
.lh-kicker { color: var(--accent); font-weight: 500; font-size: .9em; }
.lesson-head h1 { font-size: 1.7em; line-height: 1.3; margin: 4px 0 6px; letter-spacing: -0.02em; }
.lh-sub { margin: 0 0 4px; color: var(--muted); }
.lh-pages { margin: 0 0 14px; font-size: .85em; color: var(--muted); }
.goal-box { background: var(--accent-soft); border-radius: 14px; padding: 14px 18px; }
.goal-box ul { margin: 6px 0 0; padding-left: 1.2em; }

.block { background: var(--panel); border-radius: 20px; padding: 22px; margin-bottom: 18px; border: 1px solid var(--line); }
.block > h2 { display: inline; font-size: 1.25em; margin: 0 0 0 6px; vertical-align: middle; }
.block-tag { display: inline-block; vertical-align: middle; background: var(--accent); color: var(--on-accent, #fff); font-weight: 500; font-size: .8em; padding: 3px 12px; border-radius: 999px; }
.block-body { margin-top: 14px; }
.block.locked { opacity: .65; }
.lock { color: var(--muted); margin: 10px 0 0; }

.story-block h3 { margin: 16px 0 10px; font-size: 1.15em; }
.story-block p { line-height: 1.95; margin: 0 0 12px; }
.think { background: #fff9db; color: #5c4400; border-radius: 14px; padding: 14px 18px; font-weight: 500; margin-top: 8px; }
:root[data-theme="dark"] .think { background: #3a3214; color: #ffe8a3; }

.stairs { display: flex; gap: 6px; margin: 14px 0; overflow-x: auto; }
.stair { border: 0; flex: 1 0 auto; min-width: 64px; text-align: center; text-decoration: none; padding: 8px 6px; border-radius: 12px; background: var(--bg); font-size: .8em; font-weight: 500; color: var(--muted); display: grid; }
.stair span { font-size: 1.2em; }
.stair.done { background: #ebfbee; color: #2b8a3e; }
.stair.now { background: var(--accent); color: var(--on-accent, #fff); }
:root[data-theme="dark"] .stair.done { background: #1b3a24; color: #8ce99a; }

.step { border-top: 1px solid var(--line); padding: 18px 0 6px; scroll-margin-top: 70px; }
.step h3 { margin: 0 0 10px; font-size: 1.15em; line-height: 1.4; }
.step p { margin: 0 0 10px; }
.step.locked h3 { color: var(--muted); }
.remember { background: #ebfbee; border-radius: 14px; padding: 14px 18px; margin: 14px 0; color: #1b4b24; }
:root[data-theme="dark"] .remember { background: #1b3a24; color: #d3f9d8; }
.remember .rp { font-size: 1.1em; font-weight: 500; margin: 6px 0; }
.remember ul { margin: 0; padding-left: 1.2em; }
.check { background: var(--bg); border-radius: 14px; padding: 14px 16px; }
.check-h { font-weight: 500; color: var(--accent); }
.check-q, .tq p { font-weight: 500; margin: 8px 0; }
.opts { display: grid; gap: 8px; }
.opt { display: flex; gap: 10px; align-items: flex-start; text-align: left; min-height: 52px; padding: 12px 14px; border-radius: 12px; border: 2px solid var(--line); background: var(--panel); font-weight: 500; line-height: 1.45; }
.opt span { color: var(--accent); font-weight: 500; }
.opt.sel { border-color: var(--accent); background: var(--accent-soft); }
.opt.right { border-color: var(--ok); background: #ebfbee; color: #1b4b24; }
.opt.wrong { border-color: var(--bad); background: #fff5f5; color: #5c1a1a; }
.check-msg { margin-top: 8px; font-weight: 500; }

.one-line { font-size: 1.15em; font-weight: 500; }
.sum-list li { margin: 6px 0; }
.rc-mini { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 12px 0; }
.rc-mini > div { background: var(--bg); border-radius: 12px; padding: 12px 14px; }
.rc-mini small { display: block; font-weight: 500; color: var(--accent); }
.why-me { background: var(--accent-soft); border-radius: 12px; padding: 12px 14px; margin: 12px 0; }
.kw-chips { display: grid; gap: 6px; }
.kw-chips span { background: var(--bg); border-radius: 10px; padding: 8px 12px; font-size: .9em; }
hr { border: 0; border-top: 1px dashed var(--line); margin: 20px 0; }

.solo-game + .solo-game { margin-top: 18px; }
.site .scoreboard { display: none; }
.site .game-stage { padding: 14px; }
.site .q-text { font-size: 1.2em; }
.site .ox { min-height: 100px; font-size: 64px; }
.site .choices { grid-template-columns: 1fr; }
.site .choice { min-height: 60px; font-size: 1em; }
.site .match { gap: 12px; }
.site .card-btn, .site .m-item { min-height: 56px; font-size: .95em; padding: 10px 14px; }
.site .sort-card { font-size: 1.2em; min-height: 100px; }
.site .bucket-btn { min-height: 60px; font-size: 1em; }
.site .timer-time { font-size: 1.3em; }
.site .game-title { font-size: 1.1em; }
.mission-list li { margin: 6px 0; }
.note { color: var(--muted); font-size: .9em; }

.test { padding-left: 1.3em; display: grid; gap: 16px; }
.tq.ok > p::before { content: "⭕ "; } .tq.no > p::before { content: "❌ "; }
.tq-why { margin-top: 8px; background: var(--bg); border-radius: 10px; padding: 10px 12px; font-size: .92em; }
.submit { display: block; width: 100%; min-height: 60px; margin-top: 16px; border: 0; border-radius: 14px; background: var(--accent); color: var(--on-accent, #fff); font-size: 1.15em; font-weight: 500; }
.pass, .fail { margin-top: 16px; border-radius: 14px; padding: 18px; font-size: 1.2em; font-weight: 500; text-align: center; }
.pass { background: #ebfbee; color: #2b8a3e; }
.fail { background: #fff4e6; color: #a34700; font-size: 1em; }
.passed-msg { font-weight: 500; color: var(--ok); }

.action { font-size: 1.1em; font-weight: 500; }
.exit-q { display: block; font-weight: 500; margin: 10px 0 6px; }
.note-area { width: 100%; min-height: 100px; border-radius: 12px; border: 2px solid var(--line); background: var(--bg); color: var(--text); padding: 12px; font: inherit; }

.next-lesson { display: block; text-align: right; text-decoration: none; background: var(--panel); border: 2px solid var(--line); border-radius: 16px; padding: 16px 20px; }

.search { width: 100%; min-height: 50px; border-radius: 12px; border: 2px solid var(--line); background: var(--panel); color: var(--text); padding: 0 14px; font: inherit; margin-bottom: 14px; }
.dict { display: grid; gap: 8px; }
.dict-item { display: grid; gap: 2px; text-decoration: none; background: var(--panel); border-radius: 12px; padding: 12px 16px; border: 1px solid var(--line); }
.dict-item small { color: var(--muted); }

.xp-toast, .toast { position: fixed; left: 50%; top: 70px; transform: translateX(-50%); z-index: 60; border-radius: 999px; padding: 10px 22px; font-weight: 500; animation: floatUp 1.4s ease forwards; }
.xp-toast { background: #fab005; color: #3b2a00; }
.toast { background: var(--accent); color: var(--on-accent, #fff); animation-duration: 2.2s; }
@keyframes floatUp { 0% { opacity: 0; transform: translate(-50%, 10px); } 15% { opacity: 1; transform: translate(-50%, 0); } 80% { opacity: 1; } 100% { opacity: 0; transform: translate(-50%, -20px); } }

@media (max-width: 560px) {
  .plan-name { display: none; }
  .rc-mini { grid-template-columns: 1fr; }
  .lesson-head h1 { font-size: 1.45em; }
}

/* ================= 전자칠판 모드 (body.board) ================= */
.board-only, .board-pager, .lesson-nav { display: none; }
.board-btn.on { background: var(--accent); color: var(--on-accent, #fff); border-color: var(--accent); }

body.board { font-size: var(--board-font, 22px); }
.board .board-only { display: inline-flex; }
.board .topbar { padding: 12px 24px; }
.board .top-btn { min-height: 52px; padding: 0 18px; font-size: 18px; }
.board .logo { font-size: 22px; }
.board .xp { font-size: 18px; }
.board .unit-tabs { padding: 10px 24px; }
.board .utab { font-size: 20px; padding: 10px 20px; }
.board .main { max-width: none; padding: 0; }

/* 처음 화면 */
.board .main > .hero, .board .main > .lesson-list { margin-left: 32px; margin-right: 32px; }
.board .hero { margin-top: 24px; padding: 32px 40px; }
.board .lesson-list { grid-template-columns: repeat(auto-fill, minmax(520px, 1fr)); gap: 16px; padding-bottom: 40px; }
.board .lesson-card { padding: 20px 24px; min-height: 110px; }
.board .lc-no { width: 56px; height: 56px; }

/* 차시: 왼쪽 차례 + 오른쪽 한 장 */
.board .lesson-wrap { display: grid; grid-template-columns: 250px 1fr; height: calc(100vh - 124px); height: calc(100dvh - 124px); }
.board .lesson-nav {
  display: flex; flex-direction: column; gap: 6px; overflow-y: auto; padding: 18px 14px;
  background: var(--panel); border-right: 1px solid var(--line); font-size: 19px;
}
.ln-title { font-weight: 500; font-size: 22px; padding: 4px 10px 10px; color: var(--accent); }
.ln-item {
  display: flex; align-items: center; gap: 8px; text-align: left; min-height: 58px; padding: 8px 14px;
  border-radius: 14px; border: 0; background: transparent; font-weight: 500; line-height: 1.3;
}
.ln-item span { flex: 1; }
.ln-item:hover { background: var(--bg); }
.ln-item.on { background: var(--accent); color: var(--on-accent, #fff); }
.ln-item.locked { color: var(--muted); opacity: .6; }
.ln-item.done b { color: var(--ok); }
.ln-item.on b { color: var(--on-accent, #fff); }

.board .lesson-main { display: flex; flex-direction: column; overflow-y: auto; padding: 28px 48px 0; }
.board .lesson-main > .crumb,
.board .lesson-main > section:not(.bcur),
.board .lesson-main > .next-lesson { display: none; }
.board .lesson-main > section.bcur { flex: 1 0 auto; margin-bottom: 0; animation: boardIn .3s ease; }
@keyframes boardIn { from { opacity: 0; transform: translateX(24px); } to { opacity: 1; transform: none; } }
.board .block, .board .lesson-head { padding: 36px 48px; border-radius: 28px; }
.board .block > h2 { font-size: 1.3em; }
.board .block-tag { font-size: .7em; padding: 4px 16px; }

.board .lesson-head h1 { font-size: 2.3em; margin: 10px 0 14px; }
.board .lh-kicker { font-size: .9em; }
.board .lh-sub { font-size: 1.15em; color: var(--text); font-weight: 500; }
.board .goal-box { padding: 24px 30px; font-size: 1.05em; margin-top: 20px; }

.board .story-block h3 { font-size: 1.25em; }
.board .story-block p { line-height: 1.95; max-width: 1500px; }
.board .think { font-size: 1.1em; padding: 22px 28px; }

/* 계단: 설명은 왼쪽, 꼭 기억 + 확인문제는 오른쪽 */
.board #stepsBlock > .block-tag, .board #stepsBlock > h2, .board #stepsBlock .stairs { display: none; }
.board #stepsBlock .step:not(.bcur) { display: none; }
.board #stepsBlock .step.bcur { border-top: 0; padding: 0; display: grid; grid-template-columns: 1.15fr 1fr; gap: 20px 40px; align-items: start; }
.board .step.bcur > h3 { grid-column: 1 / -1; font-size: 1.45em; margin: 0 0 6px; }
.board .step.bcur.locked > .lock { grid-column: 1 / -1; }
.board .step-body p { line-height: 1.85; }
.board .remember { margin-top: 0; padding: 22px 26px; }
.board .remember .rp { font-size: 1.15em; }
.board .check { padding: 22px 24px; margin-top: 16px; }
.board .opt { min-height: 72px; padding: 14px 20px; font-size: .95em; }
.board .opt span { font-size: 1.1em; }

/* 정리·게임·시험·실천 */
.board .one-line { font-size: 1.3em; }
.board .sum-list li { margin: 10px 0; }
.board .rc-mini > div, .board .why-me { padding: 20px 24px; }
.board .kw-chips { grid-template-columns: repeat(auto-fill, minmax(420px, 1fr)); }
.board .scoreboard { display: flex; }
.board .game-stage { padding: 24px; }
.board .q-text { font-size: 1.3em; }
.board .choices { grid-template-columns: 1fr 1fr; }
.board .choice { min-height: 90px; font-size: 1em; }
.board .ox { min-height: 160px; font-size: 110px; }
.board .test { grid-template-columns: 1fr 1fr; gap: 28px 48px; }
.board .test .opts { grid-template-columns: 1fr 1fr; }
.board .test .opt { min-height: 60px; font-size: .85em; }
.board .submit { min-height: 80px; font-size: 1.1em; }
.board .action { font-size: 1.3em; }
.board .note-area { min-height: 140px; font-size: .9em; }

/* 아래 넘김 버튼 */
.board .board-pager {
  display: flex; align-items: center; gap: 16px; position: sticky; bottom: 0;
  padding: 16px 0 20px; background: linear-gradient(transparent, var(--bg) 30%); margin-top: 16px;
}
.bp-btn { min-width: 200px; min-height: 76px; border: 0; border-radius: 18px; background: var(--panel); border: 2px solid var(--line); font-size: 24px; font-weight: 500; }
.bp-btn.next { margin-left: auto; background: var(--accent); color: var(--on-accent, #fff); border-color: var(--accent); }
.bp-btn.next.blocked { background: var(--line); color: var(--muted); border-color: var(--line); }
.bp-btn.next.glow { animation: glow 1.2s ease-in-out infinite; }
@keyframes glow { 50% { box-shadow: 0 0 0 10px rgba(91, 75, 219, .25); transform: scale(1.04); } }
.bp-pos { flex: 1; text-align: center; font-size: 22px; font-weight: 500; color: var(--muted); }

/* 에스코어 드림 3~5, 왼쪽 차례 줄이기 */
.board .lesson-nav { font-size: 15px; padding: 12px 8px; gap: 3px; }
.ln-title { font-size: 17px !important; font-weight: 500; }
.ln-item { min-height: 44px !important; padding: 6px 10px !important; font-weight: 400 !important; border-radius: 10px !important; }
.ln-item.on { font-weight: 500 !important; }
.board .top-btn { min-height: 44px; font-size: 15px; padding: 0 14px; }
.board .logo { font-size: 18px; }
.board .xp { font-size: 15px; }
.board .utab { font-size: 16px; padding: 8px 16px; }
.board .lesson-main { padding: 22px 36px 0; }
.board .block, .board .lesson-head { padding: 28px 36px; }
.board .lesson-head h1 { font-size: 2em; }
.bp-btn { min-width: 160px; min-height: 60px; font-size: 19px; font-weight: 500; }
.bp-pos { font-size: 17px; font-weight: 400; }
.lc-sub, .lh-pages, .crumb, .plan-name, .note, .kw-chips span, .tq-why { font-weight: 300; }
.story-block p, .step-body p { font-weight: 400; }
.lh-sub { font-weight: 400 !important; }
.opt { font-weight: 400; }
.tb-chip { display: inline-block; margin-left: 10px; font-size: .62em; font-weight: 300; color: var(--muted); background: var(--bg); border-radius: 8px; padding: 2px 10px; vertical-align: middle; }


.step-img { display: block; width: 100%; max-width: 560px; border-radius: 16px; margin: 6px 0 12px; box-shadow: 0 4px 14px rgba(0,0,0,.1); }


/* ---------- 입장 비밀번호 화면 ---------- */
#gate { position: fixed; inset: 0; z-index: 100; display: grid; place-items: center; padding: 16px; background: linear-gradient(135deg, #5b4bdb, #1971c2); }
.gate-box { width: min(420px, 100%); background: var(--panel); color: var(--text); border-radius: 24px; padding: 32px 28px; text-align: center; box-shadow: 0 20px 60px rgba(0,0,0,.25); }
.gate-logo { width: 64px; height: 64px; margin: 0 auto 10px; border-radius: 18px; background: var(--accent); color: var(--on-accent, #fff); display: grid; place-items: center; font-size: 30px; font-weight: 500; }
.gate-box h1 { margin: 0 0 6px; font-size: 1.5em; font-weight: 500; }
.gate-box p { margin: 0 0 18px; color: var(--muted); font-weight: 300; }
.gate-box input[type=password] { width: 100%; min-height: 56px; border-radius: 14px; border: 2px solid var(--line); background: var(--bg); color: var(--text); padding: 0 16px; font: inherit; font-size: 1.1em; text-align: center; }
.gate-remember { display: block; margin: 12px 0 16px; font-size: .9em; color: var(--muted); }
.gate-box button { width: 100%; min-height: 56px; border: 0; border-radius: 14px; background: var(--accent); color: var(--on-accent, #fff); font-size: 1.1em; font-weight: 500; }
.gate-box button:disabled { opacity: .6; }
.gate-msg { margin-top: 12px; color: var(--bad); min-height: 1.4em; }

/* 계단 안 교과서 발췌 */
.step-quotes { margin: 12px 0; display: grid; gap: 8px; }
.step-quote { border-left: 6px solid #c2255c; background: #fff0f6; border-radius: 10px; padding: 10px 14px; font-size: .92em; }
.step-quote small { display: block; color: #a61e4d; font-weight: 500; }
.step-quote p { margin: 2px 0 0; font-weight: 300; color: #3b1d2a; }
.step-quote .fix { margin-top: 6px; background: #fff4e6; border-radius: 8px; padding: 6px 10px; color: #5c3200; }
:root[data-theme="dark"] .step-quote { background: #3a1626; }
:root[data-theme="dark"] .step-quote p { color: #ffdeeb; }

/* 마지막 문제 "끝" 단추와 수고하셨습니다 팝업 */
.q-nav .q-end { background: #2f9e44; color: #fff; border-color: #2f9e44; font-weight: 500; }
.finish-pop { position: fixed; inset: 0; z-index: 9000; background: rgba(0, 0, 0, .45); display: grid; place-items: center; animation: fp-in .2s ease-out; }
.finish-card { background: #fff; color: #1d232b; border-radius: 28px; padding: 44px 64px 36px; text-align: center; box-shadow: 0 20px 60px rgba(0, 0, 0, .3); animation: fp-pop .35s cubic-bezier(.2, 1.4, .4, 1); }
.finish-emoji { font-size: 84px; line-height: 1; }
.finish-card h2 { font-size: 52px; font-weight: 500; margin: 16px 0 8px; }
.finish-card p { font-size: 24px; margin: 0 0 26px; color: #4a5260; }
.finish-close { font: inherit; font-size: 22px; font-weight: 500; padding: 12px 40px; border-radius: 14px; border: 0; background: var(--accent, #1f6feb); color: var(--on-accent, #fff); cursor: pointer; }
@keyframes fp-in { from { opacity: 0; } }
@keyframes fp-pop { from { transform: scale(.7); opacity: 0; } }

/* 교과서 원문: 접어 두고 필요할 때 펼침 (휴대폰에서 길어지지 않게) */
.step-quotes-wrap { margin: 12px 0; border: 1.5px solid #f3c4d6; border-radius: 12px; background: #fff7fa; }
.step-quotes-wrap summary { cursor: pointer; padding: 10px 14px; font-weight: 500; color: #a61e4d; list-style: none; }
.step-quotes-wrap summary::-webkit-details-marker { display: none; }
.step-quotes-wrap summary::after { content: " ▾"; }
.step-quotes-wrap[open] summary::after { content: " ▴"; }
.step-quotes-wrap .step-quotes { margin: 0; padding: 0 10px 10px; }
:root[data-theme="dark"] .step-quotes-wrap { background: #2a1420; border-color: #5a2a40; }

/* ---------- 포커스 윤곽선: 다크 모드에서는 밝은 파랑 ---------- */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) { --focus: #74c0fc; }
}

/* ---------- 좁은 화면(휴대폰): 전자칠판 모드가 저장돼 있어도 1열로 ---------- */
@media (max-width: 700px) {
  .topbar { flex-wrap: wrap; }
  .board .topbar { padding: 10px 16px; }
  .board .unit-tabs { padding: 10px 16px; }
  .board .main > .hero, .board .main > .lesson-list { margin-left: 16px; margin-right: 16px; }
  .board .hero { padding: 22px; }
  .board .lesson-list { grid-template-columns: 1fr; }
  .board .lesson-wrap { grid-template-columns: 1fr; height: auto; }
  .board .lesson-nav { display: none; }
  .board .lesson-main { overflow: visible; padding: 16px 14px 0; }
  .board .block, .board .lesson-head { padding: 20px 18px; border-radius: 20px; }
  .board #stepsBlock .step.bcur { grid-template-columns: 1fr; }
  .board .test, .board .test .opts, .board .choices, .board .kw-chips { grid-template-columns: 1fr; }
  .board .ox { min-height: 100px; font-size: 64px; }
  .board .board-pager { gap: 8px; }
  .bp-btn { min-width: 0; flex: 1; font-size: 16px; padding: 0 8px; }
  .bp-pos { flex: 0 0 auto; font-size: 14px; }
}

/* 계단 쪽 나누기: 설명 쪽에서는 확인문제를, 확인문제 쪽에서는 설명을 숨겨 스크롤 없이 한 화면에 */
.board .step.bcur.pa .check { display: none; }
.board .step.bcur.pb { grid-template-columns: 1fr; }
.board .step.bcur.pb > .step-body, .board .step.bcur.pb .step-img, .board .step.bcur.pb .remember { display: none; }
.board .step.bcur.pb .check { margin-top: 0; padding: 32px 40px; }
.board .step.bcur.pb .check-q { font-size: 1.3em; }
.board .step.bcur.pb .opt { min-height: 84px; font-size: 1.05em; }
.board #stepsBlock { padding-top: 22px; padding-bottom: 22px; }
.board .step.bcur.pa .step-img { width: 100%; max-height: 30vh; object-fit: cover; }
.board .step.bcur.pb .step-side { grid-column: 1 / -1; width: 100%; }
.board .step.bcur.pb .check { padding: 26px 40px; }

/* 넘치는 쪽 나누기: 지금 장이 아닌 항목 숨김 */
.board .bhide { display: none !important; }
/* 전자칠판: 순서 맞추기 칸을 두 줄로 놓아 한 화면에 */
.board .order-slots { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; grid-auto-flow: column; grid-template-rows: repeat(4, auto); }
/* 전자칠판 게임: 짝짓기·순서 카드 높이를 줄여 한 화면에 */
.board .game-stage { padding: 16px 20px; }
.board .scoreboard { margin-bottom: 10px; }
.board .team-btns button { height: 28px; }
.board .match .col { gap: 8px; }
.board .site .m-item, .board .m-item, .board .card-btn { min-height: 50px; padding: 8px 16px; }
.board .cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 8px; }
.board .slot { min-height: 50px; padding: 8px 14px; }
/* 전자칠판 게임 쪽: 겹치는 제목을 빼고 점수판을 한 줄로 */
.board #gameBlock { padding: 20px 32px; }
.board #gameBlock > .block-tag, .board #gameBlock > h2 { display: none; }
.board .team { padding: 4px 10px; }
.board .team-btns { grid-auto-flow: column; }
.board .match .m-item { min-height: 44px; padding: 6px 14px; }
/* 전자칠판 게임: 칸 높이를 글자 크기(em)에 맞춰, 넘칠 때 글자를 줄이면 칸도 같이 줄게 */
.board .slot, .board .card-btn, .board .match .m-item { min-height: 2.3em; padding: .3em .8em; }
.board .order-slots, .board .cards, .board .match .col { gap: .4em; }
.board .game-tools button, .board .again { min-height: 2.3em; }
.board .team-score { font-size: 1.5em; }

/* ===== 전자칠판: 여백 최소화 (화면을 최대한 채우기) ===== */
.board .topbar { padding: 6px 14px; gap: 10px; }
.board .top-btn { min-height: 44px; padding: 0 14px; }
.board .unit-tabs { padding: 4px 14px; gap: 6px; }
.board .utab { padding: 6px 14px; }
.board .lesson-wrap { grid-template-columns: 190px 1fr; height: calc(100vh - 98px); height: calc(100dvh - 98px); }
.board .lesson-main { padding: 8px 14px 0 12px; }
.board .block, .board .lesson-head { padding: 18px 26px; border-radius: 20px; }
.board .lesson-head h1 { margin: 4px 0 8px; }
.board .goal-box { padding: 14px 20px; margin-top: 12px; }
.board #stepsBlock .step.bcur { gap: 12px 24px; }
.board .step.bcur > h3 { margin: 0 0 2px; }
.board .remember { padding: 14px 20px; }
.board .check { padding: 14px 18px; margin-top: 10px; }
.board .game-stage { padding: 14px; }
.board .test { gap: 16px 26px; }
.board .main > .hero, .board .main > .lesson-list { margin-left: 14px; margin-right: 14px; }
.board .hero { margin-top: 10px; padding: 20px 28px; }
.board .lesson-list { gap: 10px; padding-bottom: 20px; }
.board .block { margin-bottom: 10px; }
.board .story-block p { max-width: none; }